setting major and minor lat/lon spacing

Hello,

i have a map in stereographic projection (see attached png.file). The
system is automatically adding a setting for major and minor lat/lon
labels.

Using the lines:
   res@gsnMajorLatSpacing = 1
   res@gsnMinorLatSpacing = 1
   res@gsnMajorLonSpacing = 1
   res@gsnMinorLonSpacing = 1
i try to change the default setting. Unfortunately i get the following
warnings and nothing happens.

warning:gsnMajorLatSpacing is not a valid resource in map at this time
warning:gsnMajorLonSpacing is not a valid resource in map at this time
warning:gsnMinorLatSpacing is not a valid resource in map at this time
warning:gsnMinorLonSpacing is not a valid resource in map at this time
warning:gsnMajorLatSpacing is not a valid resource in
temp-develop_contour at this time
warning:gsnMajorLonSpacing is not a valid resource in
temp-develop_contour at this time
warning:gsnMinorLatSpacing is not a valid resource in
temp-develop_contour at this time
warning:gsnMinorLonSpacing is not a valid resource in
temp-develop_contour at this time

What can i do to manually define the lat/lon label spacing? I want to
have only full degree labels 52 and 53°N.

Thanks in advance
Frank

-- 
++++++++++++++++++++++++++++++++++++++++++++
Dr. Frank Kreienkamp
Deutscher Wetterdienst (DWD)
Abteilung Klima- und Umweltberatung
Sachgebiet Klimaprojektionen und Klimavorhersagen
Michendorfer Chaussee 23 
14473 Potsdam
Tel.: ++49(0)331-316-346
E-Mail: frank.kreienkamp@dwd.de
++++++++++++++++++++++++++++++++++++++++++++

 ;*************************************************
 ; NCL Graphics: polar_1.ncl
 ;
 ;************************************************
 load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
 load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
 load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
 load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/shea_util.ncl"
 ;************************************************
 begin
 ;************************************************
 ; read in netCDF file
 ;************************************************
   a = addfile("temp-develop.nc","r")
   u = a->field(:,:)
   u@lat2d = a->lat(:,:) ; add 2d coordinate data
   u@lon2d = a->lon(:,:) ; add 2d coordinate data
 ;************************************************
 ; create plot
 ;************************************************
   wtype = "png"
  wtype@wkWidth = 970 ; Set the pixel size of PNG image.
  wtype@wkHeight = 1000
   wks = gsn_open_wks(wtype,"temp-develop")
   res = True
   res@gsnMaximize = True
   res@gsnDraw = False
   res@gsnFrame = False
   res@mpProjection = "Stereographic"
   res@mpCenterLatF = 50 ; Centered over Germany
   res@mpCenterLonF = 10 ; Centered over Germany
   res@mpLimitMode = "Corners" ; choose range of map
   res@mpLeftCornerLatF = 53.7
   res@mpLeftCornerLonF = 11.0
   res@mpRightCornerLatF = 51.2
   res@mpRightCornerLonF = 15.0
   res@mpGridLatSpacingF = 1
   res@mpGridLonSpacingF = 1
   ;res@gsnMajorLatSpacing = 1 ; change maj lat tm spacing
   ;res@gsnMajorLonSpacing = 1 ; change maj lon tm spacing
   res@mpOutlineDrawOrder = "PostDraw" ; draw continental outline last
   res@mpFillDrawOrder = "PreDraw"
   res@mpDataBaseVersion = "HighRes" ; use finer database
   res@mpOutlineBoundarySets = "National"
   res@mpFillOn = False ; turns off continent gray
   res@mpLeftAngleF = 7
   res@mpRightAngleF = 8
   res@mpBottomAngleF = 6
   res@mpTopAngleF = 8
   res@mpMinLatF = 10.0
   res@pmTickMarkDisplayMode = "Always" ; Nicer tickmark labels
   res@mpGridAndLimbOn = True ; Turn on lat/lon grid
   res@mpGridLineDashPattern = 2 ; Dashed lines
   res@gsnLeftString = ""
   res@gsnMajorLatSpacing = 1
   res@gsnMinorLatSpacing = 1
   res@gsnMajorLonSpacing = 1
   res@gsnMinorLonSpacing = 1
 ;---Plot will just be created, and not drawn yet.
   plot = gsn_csm_map(wks,res) ; Create plot
   cmap = RGBtoCmap("/kp/kp05/fkreienk/data/VisTool/data/konstdat/Farben_rgb_temp.dat")
   gsn_define_colormap(wks,cmap)
 ;---adding map
   res@cnFillOn = True ; color Fill
   res@cnFillMode = "RasterFill" ; Raster Mode
   res@cnLinesOn = False ; Turn off contour lines
   res@cnLevelSelectionMode = "AutomaticLevels"
   res@cnLabelBarEndStyle = "ExcludeOuterBoxes"
   res@gsnAddCyclic = False ; regional data: not cyclic
 ;---Plot will just be created, and not drawn yet.
   plot = gsn_csm_contour_map(wks,u,res)
 ;---Drawing the plot
   draw(plot)
   frame(wks)
 
 end

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